To address the problem of sparrow search algorithm (SSA) has poor global ability, weak local development and easily falls into optimal solution, a multi-strategy improved evolutionary (MSSA) is proposed. The introduction tent chaotic map improves diversity initialization population, accelerates convergence, convergence accuracy. Endow finders with random ability to coordinate balance between development. discover dangerous individuals, mutation evolution operation completed, greedy strategy...

Aiming at the multi-parameter identification problem of an electro-hydraulic servo system, a method based on penalty mechanism reverse nonlinear sparrow search algorithm (PRN-SSA) is proposed, which transforms non-linear system into optimization in high-dimensional parameter space. In initial stage (SSA), population distribution not uniform, and process easily disturbed by local optimal solution. First, adopting learning strategy increases exploratory nature individuals population, improves...

During the operation of valve-controlled cylinder position systems, there are some problems, such as uncertainty and time-varying system parameters, imprecise modeling, external interference. These problems will affect loading accuracy safety reliability electro-hydraulic servo system. This paper used a research object, mathematical model was established. Then, sliding mode variable structure controller dynamic soft were designed, Grey Wolf algorithm to adjust parameters. The control effect...

The nonlinearity of clearance has a significant influence on the performance system while ensuring reliability variable-speed transmission, and hinders development controlled object according to predetermined trajectory. Aimed at transmission problem in different systems, this study summarizes existing literature provides reference for research compensation characteristics. First, is analyzed summarized, it shown that existence causes problems, such as response delay limited cycle...

Background: ADRC (active disturbance rejection controller) technology is a new practical that does not rely on the mathematical model of controlled object and has strong robustness. It integrates essence modern control theory classical proportion integral derivative good engineering application prospects. But with research development adaptive controller, problem many parameters difficulty to adjust also arises. Objective: To act as guide for future studies enhancement parameter setting,...

Abstract: The electro-hydraulic load simulator can simulate any force (torque) required by the loaded object under test conditions, which greatly reduces equipment development time and cost. However, process of loading inevitably creates a surplus (torque). existence in system will seriously interfere with accuracy even damage serious cases. In this paper, based on research status suppression compensation simulator, effective control strategies methods to overcome are summarized. This paper...

Purpose The purpose of this paper is to design a third-order linear active disturbance rejection controller (LADRC) improve the response characteristics and robustness electrohydraulic servo system. Design/methodology/approach LADRC was designed by replacing nonlinear functions in each part ADRC with or combinations, parameters were connected their bandwidth through pole configuration method reduce required tuning parameters, used an improved grey wolf optimizer tune parameters. Findings...

Abstract Aiming at the problem that auto disturbance rejection controller (ADRC) requires too many tuning parameters, this paper proposed an improved grey wolf optimizer algorithm to tune parameters of ADRC, and used ADRC with tuned control electro-hydraulic position servo system. Based on original (GWO), linear convergence factor was a non-linear mode optimize optimization path, according parameter adjustment advantages particle swarm optimization, learning factors were introduced in...

Background: There are some problems in the synchronous control system of electrohydraulic servo double hydraulic cylinders, such as uncertainty parameters, time variation, difference between two subsystems, and unbalanced load disturbance during operation. The above cause output responses cylinders to be inconsistent, resulting situation that flows not synchronized. Objective: Further improve accuracy while reducing cost using system. Methods: AMEsim simulation model electro-hydraulic...